<template>
  <view>
    <!-- 使用自定义的搜索组件 -->
    <my-search @click='gotoSearch'></my-search>
    <view class="scroll-view-container">
      <!-- 左侧的滚动视图区域 -->
      <scroll-view class="left-scroll-view" scroll-y="true" style="{height: wh + 'px'}">
        <block v-for="(item,i) in cateList" :key="i">
          <view :class="['left-scroll-view-item',i === active ? 'active' :'']" @click="activeChanged(i)">
            {{item.cat_name}}
          </view>
        </block>
      </scroll-view>
      <!-- 右侧的滚动视图区域 -->
      <scroll-view class="right-scroll-view" scroll-y="true" style="{height: wh + 'px';}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
          <!-- 二级分类的标题 -->
          <view class="cate-lv2-title"> > {{item2.cat_name}} < </view>
          <!-- 当前二级分类下的三级分类列表 -->
          <view class="cate-lv3-list">
           <!-- //三级分类的item项 -->
            <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
               <!-- //三级分类的图片 -->
                <image :src="item3.cat_icon.replace('dev','web')"></image>
               <!-- //三级分类的文本 --> 
                <text>{{item3.cat_name}}</text>
            </view>
          </view>
          </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
 import badgeMix from '@/mixins/tabbar-badge.js'
 export default {
   mixins: [badgeMix],
    data() {
      return {
        //当前设备可用高度
        wh: 0,
        cateList: [],
        active: 0,
        //二级分类列表
        cateLevel2: [],
        scrollTop:0
      };
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      console.log(sysInfo)
      this.wh = sysInfo.windowHeight - 50
      this.getCateList()
    },
    methods: {
      async getCateList() {
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/categories')
        if (res.meta.status !== 200) return uni.$showMsg()
        // 转存数据
        this.cateList = res.message
        //为二级分类赋值
        this.cateLevel2 = res.message[0].children
      },
      activeChanged(i) {
        this.active = i
        //重新为二级分类赋值
        this.cateLevel2 = this.cateList[i].children
        
        this.scrollTop = this.scrollTop === 0 ? 1 :0
      },
      //跳转到商品页面
      gotoGoodsList(item) {
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
        })
      },
      gotoSearch() {
         uni.navigateTo({
               url: '/subpkg/search/search'
             })
      }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;
  }

  .left-scroll-view {
    width: 120px;

    .left-scroll-view-item {
      // background: #F7F7F7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;

      &.active {
        background-color: #FFFFFF;
        position: relative;

        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #C00000;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
  }

  .cate-lv2-title {
    font-size: 12px;
    text-align: center;
    padding: 15px 0;
    font-weight: bold;
    background-color: #FFFFFF;
  }
  
  .cate-lv3-list {
    display: flex;
    flex-wrap: wrap;
    background-color: #FFFFFF;
    
    .cate-lv3-item {
      width: 33.33%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      margin-bottom: 10px;
      
      image {
        width: 60px;
        height: 60px;
      }
      text {
        font-size: 12px;
      }
    }
  }
</style>
